package com.jt.sp06zuul.fb;

import com.jt.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /*
    设置针对哪个后台服务进行降级
    - item -service: 只对商品服务的降级
    - * :所以服务降级
    - null :无服务降级
     */
    @Override
    public String getRoute() {
        return "item-service";
    }
    /*
    向客户端返回的数据
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse(){

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders httpHeaders = new HttpHeaders();
                httpHeaders.add("Content-Type","application/json;charset=UTF-8");
                return httpHeaders;
            }

            @Override
            public InputStream getBody() throws IOException {
                String s = JsonResult.build().code(500).msg("后台服务出错,请稍后重试").toString();

                return new ByteArrayInputStream(s.getBytes("utf-8"));
            }

            @Override
            public HttpStatus getStatusCode() throws IOException {

                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();//成文本字符串
            }

            @Override
            public void close() {
                //用来关流 上面的BAIS流不占用底层系统资源,所以不用管

            }
        };

    }
}
